Yanmar 6SY Series, Operation Manual

Page: 112 / 128

PERIODIC MAINTENANCE
104
6SY Operation Manual
Perform the following maintenance every
500 hours of operation.
• Replace Seawater Pump Impeller
• Adjust the Propeller Shaft Alignment
• Check Alternator Belt Tension
Check or Replace the Seawater
Pump Impeller (Engines with
Heat Exchanger)
Depending on use, the inside parts of the
seawater pump deteriorate and discharge
performance drops.
At the specified interval or when the
volume of seawater discharged is reduced,
inspect the seawater pump:
1. Close the sea valve (seacock) if the
marine water pump is under water.
2. Drain the seawater circuit.
3. Remove the marine water pump cap.
4. Check the impeller vanes for wear or
damage.
IMPORTANT
If the impeller must be changed
frequently, the seawater strainer must be
replaced with a unit having better
filtering capabilities.
Replace the Impeller
1. Remove the impeller using an impeller
removal tool (Figure 21, (1)) .
2. Install a new impeller and cap. If the
cap seal is hard or damaged, replace it.
Figure 21
Note: A spare impeller should be kept
on-board.
The impeller can become deformed during
long periods of inactivity. Replace or
remove the impeller before long periods of
storage.
See Long-Term Storage on
page 113.
Every 500 Hours of
Operation
A
WARNING
BURN HAZARD!
• Wait until the engine cools
before draining seawater from
the cooling system. Hot
seawater may splash and burn
you.
• Failure to comply could result
in death or serious injury.
0000016enMarine
(1)